My lmp was 20th August and finished 25th. I had sex everyday from the 27th August to 4th September. I have researched that my egg was released 3rd September. Which of the dates I had sex are most likely to have got me pregnnt? My fertile days were 30th August - 4th September

It's not possible to calculate conception dates with any degree of certainty. Gestational dates are all Best Guess based on available evidence.

OK not helpful lol... is it most likely to be the days closer to my ovulation/egg release than it is th e days before?

There is no way to know what day you conceived. You see it takes 3 to 5 days for the sperm to reach the egg and fertilize it. With encounters this close together it is impossible even to venture a guess.

If paternity is an issue, you will have to wait until the child is born for a DNA test.